Access to Facebook via mobile browser grew 112% in the past year, while mobile Twitter access experienced a 347% jump, according to a new study from comScore.

Mobile Users Favor Facebook and Twitter over MySpace

In January 2010, 25.1 million mobile users accessed Facebook via their mobile browser, up 112% from 11.8 million mobile users in January 2009. While only 4.7 million mobile users accessed Twitter from their mobile browser in January 2010, this represented 347% growth from 1.05 million mobile users in January 2009, writes MarketingCharts.

Meanwhile, mobile usage of MySpace dropped in the past year. In January 2010, 11.4 million mobile users accessed MySpace, a 7% decline from 12.3 million mobile users in January 2009.

Facebook’s mobile browser audience surpassed MySpace in February 2009, three months earlier than the Facebook audience exceeded that of MySpace on the PC-based internet in May 2009. These figures do not include access of the social networking services by the nearly 6 million mobile phone owners who do so exclusively through mobile applications.

Mobile Social Networking Grows

In general, the popularity of mobile social networking is increasing. In January 2010, 11.1% of all mobile phone users accessed a social networking site via mobile browser, an increase of 4.6 percentage points from the previous year. Much of this growth has been driven by smartphone owners, 30.8% of whom accessed social networking sites on their mobile browsers, up more than eight percentage points on the year. By comparison, just 6.8% of feature phone users accessed social networking sites on their mobile phones.